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    <title>4-文本格式化标签</title>
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    <!-- 
        b、strong 文本加粗
        em、i     文字倾斜
        del       删除线
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    <b>雷霆风暴</b>
    <strong>刀锋意志</strong>
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    <em>寒冰射手</em>
    <i>无极剑圣</i>
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    <del>19.98元</del>
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